#ifndef crypto_stream_xsalsa20_H
#define crypto_stream_xsalsa20_H

/*
 *  WARNING: This is just a stream cipher. It is NOT authenticated encryption.
 *  While it provides some protection against eavesdropping, it does NOT
 *  provide any security against active attacks.
 *  Unless you know what you're doing, what you are looking for is probably
 *  the crypto_box functions.
 */

#include <stddef.h>
#include <stdint.h>
#include "export.h"

#ifdef __cplusplus
#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wlong-long"
#endif
extern "C"
{
#endif

#define crypto_stream_xsalsa20_KEYBYTES 32U
  SODIUM_EXPORT
  size_t
  crypto_stream_xsalsa20_keybytes(void);

#define crypto_stream_xsalsa20_NONCEBYTES 24U
  SODIUM_EXPORT
  size_t
  crypto_stream_xsalsa20_noncebytes(void);

#define crypto_stream_xsalsa20_MESSAGEBYTES_MAX SODIUM_SIZE_MAX
  SODIUM_EXPORT
  size_t
  crypto_stream_xsalsa20_messagebytes_max(void);

  SODIUM_EXPORT
  int
  crypto_stream_xsalsa20(unsigned char *c, unsigned long long clen,
                         const unsigned char *n, const unsigned char *k);

  SODIUM_EXPORT
  int
  crypto_stream_xsalsa20_xor(unsigned char *c, const unsigned char *m,
                             unsigned long long mlen, const unsigned char *n,
                             const unsigned char *k);

  SODIUM_EXPORT
  int
  crypto_stream_xsalsa20_xor_ic(unsigned char *c, const unsigned char *m,
                                unsigned long long mlen, const unsigned char *n,
                                uint64_t ic, const unsigned char *k);

  SODIUM_EXPORT
  void
  crypto_stream_xsalsa20_keygen(
      unsigned char k[crypto_stream_xsalsa20_KEYBYTES]);

#ifdef __cplusplus
}
#endif

#endif
